Preparation And Characterization Of Ultrafine BaTiO₃ By Solid Phase Method

Barium titanate is an important basic electronic material, which is widely applied in the fields of current limiting protection, degaussing start, heating elements (PTC), multilayer monolithic capacitor elements (MLCC), piezoelectric elements, high dielectric ceramic capacitor, light-emitting materials and so on. The development of various electronic equipment and supplies will be surely in the direction of intelligent, reliability and humanization, which will surely bring-huge increase needs of electronic components.The barium titanate, an important basic electronic element, will surely have a bright and wide future.With the development of miniaturization and microminiaturization of handheld or wearable electronic devices, PTC, MLCC, multilayer chip are developing in the direction of miniaturization, chip, large capacity, low cost and high reliability, which therefore correspondingly requests barium titanate to be as small as possible but with high dielectric constant.This paper summarizes the related properties and usage of barium titanate, and briefly expounds the several production processes of barium titanate, especially the traditional methods and new trends of the solid phase method. The new methods can compound ultrafine barium titanate through the preparation of intermediate of barium carbonate and titanium dioxide. The preparation of ultrafine barium titanate is based on solid state method, and the particle size is greatly reduced. The specific surface area has greatly improvement of ultrafine barium carbonate and ultrafine titanium dioxide as intermediates, which broke through the solid state method to produce barium titanate restrictions on particle size, to make small particle size of barium titanate.First, this paper discusses the production methods and process of intermediates ultrafine barium carbonate, and then remove the impurities and iron from the raw material, using reagent A and solution A, and finally through the adjustment of feeding method, reaction temperature, thermal insulation, washing and microwave drying methods to get the ultrafine barium carbonate, which can also reduce the energy consumption of drying process. And then the productionprocess of intermediates of ultrafine titanium dioxide was discussed. We get the clear titanium tetrachloride aqueous solution through special process and preparation, then put special reagent B, and through ceramic membrane washing with high temperature calcined and controlled by certain calcining process curve to get the ultrafine titanium dioxide, and during the process of declination of energy calcinations, the waste gases, waste liquids are processed separately. Finally, we mixed the ultrafine barium carbonate intermediate and ultrafine titanium dioxide by ball mill, and added the reagents to avoid the introduction of impurities and by large particle during grinding process and reducing the usage of solvent, to reduce the energy consumption of the slurry in the drying process. Thenthe dried mixture was broken with mesh to increase its activity before burning, and control the synthesis procedure of barium titanate according to specific calcinations process curve. After synthesis, we can finally get the finished ultrafine barium titanate through ball grinding, sanding, spray sieving and other solutions.